ISSN (Print) : 2320 – 3765 ISSN (Online): 2278 – 8875 International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (An ISO 3297: 2007 Certified Organization) Vol. 3, Issue 4, April 2014 Copyright to IJAREEIE www.ijareeie.com 9245 Comparative Study between Conventional PID and Fuzzy Logic Controller for a Current Controlled D.C. Drive Using MATLAB/Simulink Shubhajit Pal 1 , Sukumar Das 2 , Prof. Goutam Kumar Panda 3 , Prof. Pradip Kumar Saha 4 P.G. Scholar, Dept. of Electrical Engineering, Jalpaiguri Govt. Engineering College, Jalpaiguri, India 1 P.G. Scholar, Dept. of Electrical Engineering, Jalpaiguri Govt. Engineering College, Jalpaiguri, India 2 HOD and Professor, Dept. of Electrical Engineering, Jalpaiguri Govt. Engineering College, Jalpaiguri, India 3 Professor, Dept. of Electrical Engineering, Jalpaiguri Govt. Engineering College, Jalpaiguri, India 4 ABSTRACT: This paper describes a closed loop model of a current controlled PMDC motor drive with two controller FUZZY & PID separately, then comparison of the effect on output parameters for this two different controller is established. The differences between the output speed of PMDC motor & a preset reference speed is fed as an error signal to the controller of the system. The output of the speed controller (actuating signal) controls the duty cycle of converter and hence controls the converter output. Through this controlled converter output, required voltage gets injected into the motor. A small change in the injected voltage can cause a large change in the motor current and hence leading to a particular drive control feature. In the past few years Fuzzy Logic became a very much popular choice of controller for feedback control of various industrial systems. Fuzzy logic control is much closer in spirit to human thinking and logical reasoning than conventional controller like PID or PI. Recent study shows that this type of controller (FUZZY) provides better settling time, low peak overshoot and less percent of steady state error in overall system output which leads to better stability of overall system. In this Paper, a performance analysis of the conventional PID controller and fuzzy logic controller has been done by the use of MATLAB. KEYWORDS: Permanent Magnet DC motor, DC-DC Step-down Chopper, Closed Loop Control, Proportional- Integral-Derivation controller, Fuzzy Controller. I. RELATED WORK PM motor drives have been a topic of interest for the last twenty years. Different authors have carried out modelling and simulation of such drives. The three most common speed control methods of a dc motor are field resistance control, armature voltage control, and armature resistance control [1][2] . Depending on the armature voltage control method simulink model of a current mode buck-type dc chopper-fed permanent-magnet (PM) dc motor drive with proportional controller in its feedback loop is realized [3][4] . But the importance of PID controllers in process industry cannot be overemphasized because although some modern controllers like FUZZY got popularity, the majority of the industrial controllers use PID or modified PID control schemes [5] . Investigate through both numerically and through simulink model, the characteristics of different electrical parameters [current, speed, different torques working etc] of current mode buck-type dc chopper-fed permanent-magnet (PM) dc motor with PID controller in its feedback loop is also done [6][7] . Fuzzy control is proposed as one of the most active and fruitful areas of research especially in industrial processes. Fuzzy control is based on fuzzy logic, a logical system which is much closer to human thinking and natural language than traditional logical systems [8] . It is also shown that, fuzzy logic controller (FLC) based on fuzzy logic provides a means of converting a linguistic control strategy based on expert knowledge into an automatic control strategy. Fuzzification, defuzzification strategies and fuzzy control rules are used in fuzzy reasoning mechanism [9] .